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Dissolution of $UO_2$, $UO_3$ and of some lanthanide oxides in Bumim $Tf_2$N: effect of acid and water and formation of $UO_2(NO_3)_3^–$

Abstract : UO_2, UO_3, Nd_2O_3, Eu_2O_3 and Pr_6O_11 powders were successfully dissolved in the ionic liquid 1-methyl-3-butyl-imidazolium bistriflimide (BumimTf_2N) with the help of small amounts of HNO_3. The uranyl species have been characterised through UV-vis and EXAFS spectroscopies. The uranium dissolution leads to the formation of UO_2(NO_3)_3^–, even in the presence of water. The kinetics of UO_2 dissolution/oxidation is intricate, due to the transient existence of NO_2^–, which is absent in the case of the UO_3 dissolution, occurring with no change in the oxidation state of U.
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Submitted on : Monday, October 22, 2007 - 3:24:44 PM
Last modification on : Monday, November 23, 2020 - 6:30:04 PM

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I. Billard, C. Gaillard, C. Hennig. Dissolution of $UO_2$, $UO_3$ and of some lanthanide oxides in Bumim $Tf_2$N: effect of acid and water and formation of $UO_2(NO_3)_3^–$. Dalton Transactions, Royal Society of Chemistry, 2007, pp.4214-4221. ⟨10.1039/b706355e⟩. ⟨in2p3-00180956⟩

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